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    <article class="post">
        <header>
            <h1 class="post-title">Flutter与IM</h1>
        </header>
        <date class="post-meta meta-date">
            2021年8月23日
        </date>
        
        <div class="post-meta">
            <span>|</span>
            
            <span class="meta-category"><a href='/categories/Flutter'>Flutter</a></span>
            
        </div>
        
        
        <div class="post-meta">
            <span id="busuanzi_container_page_pv">|<span id="busuanzi_value_page_pv"></span><span>
                    阅读</span></span>
        </div>
        
        
        <div class="post-content">
            <p>我想知道，你如何在<strong>Dart</strong>中将调用转换回 Future(Promise)。这是如何：</p>
<h1 id="dart--将回调转换为-future">Dart — 将回调转换为 Future</h1>
<h1 id="dart--convert-callback-to-future">Dart — convert callback to Future</h1>
<pre><code>Future time(int time) async {

  Completer c = new Completer();
  new Timer(new Duration(seconds: time), (){
    c.complete('done with time out');
  });

  return c.future;
}
</code></pre><p>If you have any other questions let me know! I try to respond within the hour!</p>
<p><a href="https://gitee.com/bigpowers/f-lutter_im_yin/blob/master/lib/webSocketPage/chatContact.dart">https://gitee.com/bigpowers/f-lutter_im_yin/blob/master/lib/webSocketPage/chatContact.dart</a></p>
<h1 id="jsondecode-unexpected-end-of-input-at-character-1">json.decode() Unexpected end of input (at character 1)</h1>
<div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-dart" data-lang="dart"><span style="color:#66d9ef">import</span> <span style="color:#e6db74">&#39;dart:convert&#39;</span>;

<span style="color:#66d9ef">import</span> <span style="color:#e6db74">&#39;package:flutter/material.dart&#39;</span>;
<span style="color:#66d9ef">import</span> <span style="color:#e6db74">&#39;package:restaurant_app/globalVar.dart&#39;</span>;
<span style="color:#66d9ef">import</span> <span style="color:#e6db74">&#39;package:restaurant_app/homescreen.dart&#39;</span>;
 <span style="color:#66d9ef">import</span> <span style="color:#e6db74">&#39;package:flutter_secure_storage/flutter_secure_storage.dart&#39;</span>;
 <span style="color:#66d9ef">import</span> <span style="color:#e6db74">&#39;package:restaurant_app/signup.dart&#39;</span>;
<span style="color:#66d9ef">import</span> <span style="color:#e6db74">&#39;package:http/http.dart&#39;</span> <span style="color:#66d9ef">as</span> http;
<span style="color:#66d9ef">import</span> <span style="color:#e6db74">&#39;package:flutter_html_view/html_parser.dart&#39;</span>;

<span style="color:#66d9ef">class</span> <span style="color:#a6e22e">SignIn</span> <span style="color:#66d9ef">extends</span> StatefulWidget {
 <span style="color:#960050;background-color:#1e0010">@</span>override
_SignInState createState() <span style="color:#f92672">=&gt;</span> _SignInState();
}

<span style="color:#66d9ef">class</span> <span style="color:#a6e22e">_SignInState</span> <span style="color:#66d9ef">extends</span> State<span style="color:#f92672">&lt;</span>SignIn<span style="color:#f92672">&gt;</span> <span style="color:#66d9ef">with</span> SingleTickerProviderStateMixin 
{
TabController controller;
TextEditingController _email <span style="color:#f92672">=</span> <span style="color:#66d9ef">new</span> TextEditingController();
TextEditingController _password <span style="color:#f92672">=</span> <span style="color:#66d9ef">new</span> TextEditingController();
<span style="color:#66d9ef">bool</span> loading;

 <span style="color:#66d9ef">final</span> GlobalKey<span style="color:#f92672">&lt;</span>ScaffoldState<span style="color:#f92672">&gt;</span> _scaffoldKey <span style="color:#f92672">=</span> <span style="color:#66d9ef">new</span> GlobalKey<span style="color:#f92672">&lt;</span>ScaffoldState<span style="color:#f92672">&gt;</span> 
();

<span style="color:#960050;background-color:#1e0010">@</span>override
<span style="color:#66d9ef">void</span> initState() {
<span style="color:#75715e">// TODO: implement initState
</span><span style="color:#75715e"></span><span style="color:#66d9ef">super</span>.initState();
controller <span style="color:#f92672">=</span> <span style="color:#66d9ef">new</span> TabController(length: <span style="color:#ae81ff">2</span>, vsync: <span style="color:#66d9ef">this</span>);
loading <span style="color:#f92672">=</span> <span style="color:#66d9ef">false</span>;
_email <span style="color:#f92672">=</span> <span style="color:#66d9ef">new</span> TextEditingController(text: <span style="color:#e6db74">&#34;rajeshvishnani&#34;</span>);
_password <span style="color:#f92672">=</span> <span style="color:#66d9ef">new</span> TextEditingController(text: <span style="color:#e6db74">&#34;Rajesh@MaaKiRasoi&#34;</span>);
}

<span style="color:#960050;background-color:#1e0010">@</span>override
<span style="color:#66d9ef">void</span> dispose() {
<span style="color:#75715e">// TODO: implement dispose
</span><span style="color:#75715e"></span><span style="color:#66d9ef">super</span>.dispose();
controller.dispose();
setState(() {
  loading <span style="color:#f92672">=</span> <span style="color:#66d9ef">false</span>;
});
_email.dispose();
_password.dispose();
}

<span style="color:#66d9ef">final</span> GlobalKey<span style="color:#f92672">&lt;</span>FormState<span style="color:#f92672">&gt;</span> _formKey <span style="color:#f92672">=</span> GlobalKey<span style="color:#f92672">&lt;</span>FormState<span style="color:#f92672">&gt;</span>();
<span style="color:#66d9ef">bool</span> _autoValidate <span style="color:#f92672">=</span> <span style="color:#66d9ef">false</span>;

Future _writer(<span style="color:#66d9ef">String</span> username, <span style="color:#66d9ef">String</span> password, <span style="color:#66d9ef">String</span> token) <span style="color:#66d9ef">async</span> {
<span style="color:#66d9ef">final</span> storage <span style="color:#f92672">=</span> <span style="color:#66d9ef">new</span> FlutterSecureStorage();
<span style="color:#66d9ef">await</span> storage.write(key: authTokenKeys, value: token);
print(<span style="color:#66d9ef">await</span> storage.read(key: authTokenKeys));
<span style="color:#66d9ef">await</span> storage.write(key: nameKeys, value: username);
print(<span style="color:#66d9ef">await</span> storage.read(key: nameKeys));
<span style="color:#66d9ef">await</span> storage.write(key: passwordKeys, value: password);
}

  <span style="color:#66d9ef">static</span> <span style="color:#66d9ef">final</span> <span style="color:#66d9ef">String</span> authTokenKeys <span style="color:#f92672">=</span> <span style="color:#e6db74">&#39;auth_token&#39;</span>;
<span style="color:#66d9ef">static</span> <span style="color:#66d9ef">final</span> <span style="color:#66d9ef">String</span> nameKeys <span style="color:#f92672">=</span> <span style="color:#e6db74">&#39;username&#39;</span>;
<span style="color:#66d9ef">static</span> <span style="color:#66d9ef">final</span> <span style="color:#66d9ef">String</span> passwordKeys <span style="color:#f92672">=</span> <span style="color:#e6db74">&#39;password&#39;</span>;

_login(username, password) <span style="color:#66d9ef">async</span> {
setState(() {
  loading <span style="color:#f92672">=</span> <span style="color:#66d9ef">true</span>;
});

<span style="color:#66d9ef">var</span> body <span style="color:#f92672">=</span> json.encode({
  <span style="color:#e6db74">&#34;username&#34;</span><span style="color:#f92672">:</span> username,
  <span style="color:#e6db74">&#34;password&#34;</span><span style="color:#f92672">:</span> password,
});

Map<span style="color:#f92672">&lt;</span><span style="color:#66d9ef">String</span>, <span style="color:#66d9ef">String</span><span style="color:#f92672">&gt;</span> headers <span style="color:#f92672">=</span> {
  <span style="color:#e6db74">&#39;Content-type&#39;</span><span style="color:#f92672">:</span> <span style="color:#e6db74">&#39;application/json&#39;</span>,
  <span style="color:#e6db74">&#39;Accept&#39;</span><span style="color:#f92672">:</span> <span style="color:#e6db74">&#39;application/json&#39;</span>,
};

<span style="color:#66d9ef">await</span> http
    .post(<span style="color:#e6db74">&#34;</span><span style="color:#e6db74">${</span>GlobalVar.Ip<span style="color:#e6db74">}</span><span style="color:#e6db74">/wp-json/jwt-auth/v1/token&#34;</span>,
        body: body, headers: headers)
    .then((response) {
  <span style="color:#66d9ef">var</span> body <span style="color:#f92672">=</span> json.decode(response.body);

  <span style="color:#66d9ef">if</span> (response.statusCode <span style="color:#f92672">==</span> <span style="color:#ae81ff">200</span>) {
    <span style="color:#75715e">// TODO: you need to store body[&#39;token&#39;] to use in some authentication
</span><span style="color:#75715e"></span>    loading <span style="color:#f92672">=</span> <span style="color:#66d9ef">false</span>;
    _writer(_email.text, _password.text, body[<span style="color:#e6db74">&#39;token&#39;</span>]);
    Navigator.pushReplacement(context,
        MaterialPageRoute(builder: (BuildContext ctx) <span style="color:#f92672">=&gt;</span> HomePage()));
  } <span style="color:#66d9ef">else</span> {
    <span style="color:#75715e">// TODO: alert message
</span><span style="color:#75715e"></span>    <span style="color:#66d9ef">final</span> snackBar <span style="color:#f92672">=</span> SnackBar(
      content: Text(body[<span style="color:#e6db74">&#39;message&#39;</span>]),
    );
    _scaffoldKey.currentState.showSnackBar(snackBar);
  }
  setState(() {
    loading <span style="color:#f92672">=</span> <span style="color:#66d9ef">false</span>;
  });
  });
}

<span style="color:#960050;background-color:#1e0010">@</span>override
 Widget build(BuildContext context) {
<span style="color:#66d9ef">return</span> Scaffold(
  key: _scaffoldKey,
  resizeToAvoidBottomPadding: <span style="color:#66d9ef">false</span>,
  body: Container(
    decoration: BoxDecoration(
      image: DecorationImage(
        image: AssetImage(<span style="color:#e6db74">&#39;images/art.png&#39;</span>),
        fit: BoxFit.fill,
        colorFilter: ColorFilter.mode(
            Colors.white12.withOpacity(<span style="color:#ae81ff">0.2</span>), BlendMode.dstATop),
      ),
    ),
    child: ListView(
      shrinkWrap: <span style="color:#66d9ef">true</span>,
      physics: BouncingScrollPhysics(),
      children: <span style="color:#f92672">&lt;</span>Widget<span style="color:#f92672">&gt;</span>[
        SizedBox(
          height: MediaQuery.of(context).size.height <span style="color:#f92672">/</span> <span style="color:#ae81ff">30</span>,
        ),
        Align(
          alignment: Alignment.topCenter,
          child: CircleAvatar(
            backgroundColor: Colors.grey,
            radius: <span style="color:#ae81ff">55.0</span>,
            backgroundImage: AssetImage(<span style="color:#e6db74">&#39;images/logo.png&#39;</span>),
          ),
        ),
        SizedBox(
          height: MediaQuery.of(context).size.height <span style="color:#f92672">/</span> <span style="color:#ae81ff">30</span>,
        ),
        Stack(
          alignment: Alignment.center,
          children: <span style="color:#f92672">&lt;</span>Widget<span style="color:#f92672">&gt;</span>[
            SizedBox(
              height: MediaQuery.of(context).size.height <span style="color:#f92672">/</span> <span style="color:#ae81ff">300</span>,
              child: <span style="color:#66d9ef">new</span> Center(
                child: <span style="color:#66d9ef">new</span> Container(
                  height: <span style="color:#ae81ff">10.0</span>,
                  color: Colors.black12,
                ),
              ),
            ),
            Row(
              children: <span style="color:#f92672">&lt;</span>Widget<span style="color:#f92672">&gt;</span>[
                SizedBox(
                  width: MediaQuery.of(context).size.width <span style="color:#f92672">/</span> <span style="color:#ae81ff">4</span>,
                ),
                Chip(
                  label: Text(
                    <span style="color:#e6db74">&#34;SIGN IN&#34;</span>,
                    style: TextStyle(color: Colors.white, fontSize: <span style="color:#ae81ff">18.0</span>),
                  ),
                  backgroundColor: Color(<span style="color:#ae81ff">0xFFD1A155</span>),
                ),
                SizedBox(
                  width: MediaQuery.of(context).size.width <span style="color:#f92672">/</span> <span style="color:#ae81ff">35</span>,
                  child: Container(
                    width: MediaQuery.of(context).size.height <span style="color:#f92672">/</span> <span style="color:#ae81ff">12</span>,
                    height: <span style="color:#ae81ff">2.0</span>,
                    color: Colors.white,
                  ),
                ),
                Chip(
                  label: Text(
                    <span style="color:#e6db74">&#34;SIGN UP&#34;</span>,
                    style: TextStyle(color: Colors.white, fontSize: <span style="color:#ae81ff">18.0</span>),
                  ),
                  backgroundColor: Colors.black87,
                ),
              ],
            )
          ],
        ),
        SizedBox(
          height: MediaQuery.of(context).size.height <span style="color:#f92672">/</span> <span style="color:#ae81ff">35</span>,
        ),
        Align(
            alignment: Alignment.center,
            child: Text(
              <span style="color:#e6db74">&#34;Welcome back!&#34;</span>,
              style: TextStyle(
                fontSize: <span style="color:#ae81ff">20.0</span>,
                color: Color(<span style="color:#ae81ff">0xFFD1A155</span>),
              ),
            )),
        SizedBox(
          height: MediaQuery.of(context).size.height <span style="color:#f92672">/</span> <span style="color:#ae81ff">30</span>,
        ),
        Form(
          key: _formKey,
          autovalidate: _autoValidate,
          child: Column(
            children: <span style="color:#f92672">&lt;</span>Widget<span style="color:#f92672">&gt;</span>[
              Theme(
                data: ThemeData(
                  hintColor: Colors.black26,
                  primaryColor: Color(<span style="color:#ae81ff">0xFFD1A155</span>),
                ),
                child: Padding(
                  padding: <span style="color:#66d9ef">const</span> EdgeInsets.only(left: <span style="color:#ae81ff">15.0</span>, right: <span style="color:#ae81ff">15.0</span>),
                  child: TextFormField(
                    keyboardType: TextInputType.emailAddress,
                    <span style="color:#75715e">//validator: _email.text.isEmpty?:null,
</span><span style="color:#75715e"></span>                    controller: _email,

                    decoration: InputDecoration(
                        border:
                            OutlineInputBorder(borderSide: BorderSide()),
                        prefixIcon: Icon(
                          Icons.email,
                          color: Color(<span style="color:#ae81ff">0xFFD1A155</span>),
                        ),
                        hintText: <span style="color:#e6db74">&#39;Email Address&#39;</span>,
                        hintStyle: TextStyle(
                            color: Colors.black,
                            fontWeight: FontWeight.w400)),
                  ),
                ),
              ),
              SizedBox(
                height: MediaQuery.of(context).size.height <span style="color:#f92672">/</span> <span style="color:#ae81ff">45</span>,
              ),
              Theme(
                data: ThemeData(
                    primaryColor: Color(<span style="color:#ae81ff">0xFFD1A155</span>),
                    hintColor: Colors.black26),
                child: Padding(
                  padding: <span style="color:#66d9ef">const</span> EdgeInsets.only(left: <span style="color:#ae81ff">15.0</span>, right: <span style="color:#ae81ff">15.0</span>),
                  child: TextFormField(
                    keyboardType: TextInputType.text,
                    obscureText: <span style="color:#66d9ef">true</span>,
                    controller: _password,
                  decoration: InputDecoration(
                        border:
                            OutlineInputBorder(borderSide: BorderSide()),
                        prefixIcon: Icon(
                          Icons.lock,
                          color: Color(<span style="color:#ae81ff">0xFFD1A155</span>),
                        ),
                        hintText: <span style="color:#e6db74">&#39;Password&#39;</span>,
                        hintStyle: TextStyle(
                            color: Colors.black,
                            fontWeight: FontWeight.w400)),
                  ),
                ),
              ),
              Padding(
                padding: <span style="color:#66d9ef">const</span> EdgeInsets.only(right: <span style="color:#ae81ff">15.0</span>, left: <span style="color:#ae81ff">10.0</span>),
                child: Row(
                  mainAxisAlignment: MainAxisAlignment.spaceBetween,
                  children: <span style="color:#f92672">&lt;</span>Widget<span style="color:#f92672">&gt;</span>[
                    Row(
                      children: <span style="color:#f92672">&lt;</span>Widget<span style="color:#f92672">&gt;</span>[
                        ActionChip(
                          onPressed: () {},
                          avatar: Checkbox(
                            value: <span style="color:#66d9ef">false</span>,
                            onChanged: (<span style="color:#66d9ef">bool</span> z) {
                              print(z);
                            },
                            activeColor: Color(<span style="color:#ae81ff">0xFFD1A155</span>),
                          ),
                          label: Text(<span style="color:#e6db74">&#34;Remember Me&#34;</span>),
                          backgroundColor: Colors.transparent,
                        ),
                      ],
                    ),
                    Text(
                      <span style="color:#e6db74">&#34;Forgot Password?&#34;</span>,
                      style: TextStyle(
                        color: Color(<span style="color:#ae81ff">0xFFD1A155</span>),
                      ),
                    ),
                  ],
                ),
              ),
              Padding(
                padding: <span style="color:#66d9ef">const</span> EdgeInsets.only(left: <span style="color:#ae81ff">15.0</span>, right: <span style="color:#ae81ff">15.0</span>),
                child: InkWell(
                  onTap: () {
                    _login(_email.text, _password.text);
         <span style="color:#75715e">//                        Navigator.push(
</span><span style="color:#75715e"></span>        <span style="color:#75715e">//                            context,
</span><span style="color:#75715e"></span>    <span style="color:#75715e">//                            MaterialPageRoute(
</span><span style="color:#75715e"></span>     <span style="color:#75715e">//                                builder: (context) =&gt; HomePage()));
</span><span style="color:#75715e"></span>                  },
                  child: loading
                      <span style="color:#f92672">?</span> CircularProgressIndicator()
                      <span style="color:#f92672">:</span> Container(
                          height: MediaQuery.of(context).size.height <span style="color:#f92672">/</span> <span style="color:#ae81ff">13</span>,
                          <span style="color:#75715e">//width: MediaQuery.of(context).size.height / 1.8,
</span><span style="color:#75715e"></span>                          decoration: BoxDecoration(
                            color: Color(<span style="color:#ae81ff">0xFFD1A155</span>),
                            borderRadius: BorderRadius.circular(<span style="color:#ae81ff">5.0</span>),
                          ),
                          child: Center(
                            child: Text(
                              <span style="color:#e6db74">&#34;LOGIN&#34;</span>,
                              style: TextStyle(
                                  color: Colors.white, fontSize: <span style="color:#ae81ff">18.0</span>),
                            ),
                          ),
                        ),
                ),
              )
            ],
          ),
        ),
        SizedBox(
          height: MediaQuery.of(context).size.height <span style="color:#f92672">/</span> <span style="color:#ae81ff">15</span>,
        ),
        Stack(
          alignment: Alignment.center,
          children: <span style="color:#f92672">&lt;</span>Widget<span style="color:#f92672">&gt;</span>[
            SizedBox(
              height: <span style="color:#ae81ff">2.0</span>,
              child: <span style="color:#66d9ef">new</span> Center(
                child: <span style="color:#66d9ef">new</span> Container(
                  height: <span style="color:#ae81ff">10.0</span>,
                  color: Colors.black12,
                ),
              ),
            ),
            Container(
              height: MediaQuery.of(context).size.height <span style="color:#f92672">/</span> <span style="color:#ae81ff">18</span>,
              width: MediaQuery.of(context).size.height <span style="color:#f92672">/</span> <span style="color:#ae81ff">11</span>,
              decoration: BoxDecoration(
                  borderRadius: BorderRadius.circular(<span style="color:#ae81ff">23.0</span>),
                  color: Colors.white,
                  border: Border.all(color: Colors.black12)),
              child: Center(
                  child: Text(
                <span style="color:#e6db74">&#34;OR&#34;</span>,
                style: TextStyle(fontSize: <span style="color:#ae81ff">18.0</span>),
              )),
            ),
          ],
        ),
        SizedBox(
          height: MediaQuery.of(context).size.height <span style="color:#f92672">/</span> <span style="color:#ae81ff">30</span>,
        ),
        Padding(
          padding: <span style="color:#66d9ef">const</span> EdgeInsets.only(left: <span style="color:#ae81ff">15.0</span>, right: <span style="color:#ae81ff">15.0</span>),
          child: Row(
            children: <span style="color:#f92672">&lt;</span>Widget<span style="color:#f92672">&gt;</span>[
              Container(
                height: MediaQuery.of(context).size.height <span style="color:#f92672">/</span> <span style="color:#ae81ff">13</span>,
                width: MediaQuery.of(context).size.width <span style="color:#f92672">/</span> <span style="color:#ae81ff">2.2</span>,
                decoration: BoxDecoration(
                    borderRadius: BorderRadius.circular(<span style="color:#ae81ff">5.0</span>),
                    color: Colors.white,
                    border: Border.all(color: Colors.black12)),
                child: Row(
                  children: <span style="color:#f92672">&lt;</span>Widget<span style="color:#f92672">&gt;</span>[
                    SizedBox(
                      width: <span style="color:#ae81ff">18.0</span>,
                    ),
                    Icon(Icons.tag_faces),
                    SizedBox(
                      width: <span style="color:#ae81ff">10.0</span>,
                    ),
                    Text(
                      <span style="color:#e6db74">&#34;Facebook&#34;</span>,
                      style: TextStyle(fontSize: <span style="color:#ae81ff">22.0</span>, color: Colors.blue),
                    ),
                  ],
                ),
              ),
              SizedBox(
                width: MediaQuery.of(context).size.width <span style="color:#f92672">/</span> <span style="color:#ae81ff">40</span>,
              ),
              Container(
                height: MediaQuery.of(context).size.height <span style="color:#f92672">/</span> <span style="color:#ae81ff">13</span>,
                width: MediaQuery.of(context).size.width <span style="color:#f92672">/</span> <span style="color:#ae81ff">2.3</span>,
                decoration: BoxDecoration(
                    borderRadius: BorderRadius.circular(<span style="color:#ae81ff">5.0</span>),
                    color: Colors.white,
                    border: Border.all(color: Colors.black12)),
                child: Row(
                  children: <span style="color:#f92672">&lt;</span>Widget<span style="color:#f92672">&gt;</span>[
                    SizedBox(
                      width: <span style="color:#ae81ff">18.0</span>,
                    ),
                    Icon(Icons.tag_faces),
                    SizedBox(
                      width: <span style="color:#ae81ff">10.0</span>,
                    ),
                    Text(
                      <span style="color:#e6db74">&#34;Google+&#34;</span>,
                      style: TextStyle(fontSize: <span style="color:#ae81ff">22.0</span>, color: Colors.red),
                    ),
                  ],
                ),
              ),
            ],
          ),
        ),
        SizedBox(
          height: MediaQuery.of(context).size.height <span style="color:#f92672">/</span> <span style="color:#ae81ff">20</span>,
        ),
        Align(
          alignment: Alignment.center,
          child: InkWell(
            onTap: () <span style="color:#f92672">=&gt;</span> Navigator.push(
                context, MaterialPageRoute(builder: (context) <span style="color:#f92672">=&gt;</span> SignUp())),
            child: RichText(
                text: TextSpan(
                    text: <span style="color:#e6db74">&#34;Don&#39;t have an account?&#34;</span>,
                    style: TextStyle(fontSize: <span style="color:#ae81ff">20.0</span>, color: Colors.black87),
                    children: <span style="color:#f92672">&lt;</span>TextSpan<span style="color:#f92672">&gt;</span>[
                  TextSpan(
                      text: <span style="color:#e6db74">&#39; Sign up&#39;</span>,
                      style: TextStyle(
                          color: Color(<span style="color:#ae81ff">0xFFD1A155</span>),
                          fontWeight: FontWeight.bold)),
                ])),
          ),
        ),
        SizedBox(
          height: MediaQuery.of(context).size.height <span style="color:#f92672">/</span> <span style="color:#ae81ff">30</span>,
        ),
      ],
    ),
  ),
  );
 }
}
</code></pre></div><p>遇到类似这样的的错误，请确保<code>.decode</code>方法的参数不应该是空对象。而不是使用这一行：</p>
<div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-dart" data-lang="dart"><span style="color:#66d9ef">var</span> body <span style="color:#f92672">=</span> json.decode(response.body);
</code></pre></div><p>试试这个，希望它对你有用。</p>
<div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-dart" data-lang="dart"><span style="color:#66d9ef">if</span>(response.body.isNotEmpty) {
    json.decode(response.body);
}
</code></pre></div><p>
        <a data-fancybox="gallery" href="https://luckly007.oss-cn-beijing.aliyuncs.com/image/image-20210824163611592.png">
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        <li style="word-break:break-all"><strong>原文链接：</strong><a href="https://luckly.work/post/flutter_tips/flutter%E4%B8%8EIM/">https://luckly.work/post/flutter_tips/flutter%E4%B8%8EIM/</a></li>
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